diff --git a/src/wp-content/themes/twentyeleven/functions.php b/src/wp-content/themes/twentyeleven/functions.php
index af7484e626..8b8c74439a 100644
--- a/src/wp-content/themes/twentyeleven/functions.php
+++ b/src/wp-content/themes/twentyeleven/functions.php
@@ -89,6 +89,9 @@ if ( ! function_exists( 'twentyeleven_setup' ) ) :
 		// Load default block styles.
 		add_theme_support( 'wp-block-styles' );
 
+		// Add support for responsive embeds.
+		add_theme_support( 'responsive-embeds' );
+
 		// Add support for custom color scheme.
 		add_theme_support(
 			'editor-color-palette',
diff --git a/src/wp-content/themes/twentyfifteen/functions.php b/src/wp-content/themes/twentyfifteen/functions.php
index a9178f6b27..cf03b1a0f0 100644
--- a/src/wp-content/themes/twentyfifteen/functions.php
+++ b/src/wp-content/themes/twentyfifteen/functions.php
@@ -177,6 +177,9 @@ if ( ! function_exists( 'twentyfifteen_setup' ) ) :
 		// Load default block styles.
 		add_theme_support( 'wp-block-styles' );
 
+		// Add support for responsive embeds.
+		add_theme_support( 'responsive-embeds' );
+
 		// Add support for custom color scheme.
 		add_theme_support(
 			'editor-color-palette',
diff --git a/src/wp-content/themes/twentyfourteen/functions.php b/src/wp-content/themes/twentyfourteen/functions.php
index 62e162d86b..79a8a3d52b 100644
--- a/src/wp-content/themes/twentyfourteen/functions.php
+++ b/src/wp-content/themes/twentyfourteen/functions.php
@@ -76,6 +76,9 @@ if ( ! function_exists( 'twentyfourteen_setup' ) ) :
 		// Load default block styles.
 		add_theme_support( 'wp-block-styles' );
 
+		// Add support for responsive embeds.
+		add_theme_support( 'responsive-embeds' );
+
 		// Add support for custom color scheme.
 		add_theme_support(
 			'editor-color-palette',
diff --git a/src/wp-content/themes/twentyseventeen/functions.php b/src/wp-content/themes/twentyseventeen/functions.php
index dde97fab7e..8a067d3a42 100644
--- a/src/wp-content/themes/twentyseventeen/functions.php
+++ b/src/wp-content/themes/twentyseventeen/functions.php
@@ -123,6 +123,9 @@ function twentyseventeen_setup() {
 	// Load default block styles.
 	add_theme_support( 'wp-block-styles' );
 
+	// Add support for responsive embeds.
+	add_theme_support( 'responsive-embeds' );
+
 	// Define and register starter content to showcase the theme on new sites.
 	$starter_content = array(
 		'widgets'     => array(
diff --git a/src/wp-content/themes/twentysixteen/functions.php b/src/wp-content/themes/twentysixteen/functions.php
index e8c75a243e..9dd1bab99e 100644
--- a/src/wp-content/themes/twentysixteen/functions.php
+++ b/src/wp-content/themes/twentysixteen/functions.php
@@ -141,6 +141,9 @@ if ( ! function_exists( 'twentysixteen_setup' ) ) :
 		// Load default block styles.
 		add_theme_support( 'wp-block-styles' );
 
+		// Add support for responsive embeds.
+		add_theme_support( 'responsive-embeds' );
+
 		// Add support for custom color scheme.
 		add_theme_support(
 			'editor-color-palette',
diff --git a/src/wp-content/themes/twentythirteen/functions.php b/src/wp-content/themes/twentythirteen/functions.php
index 2a4188b33c..a46b5f9386 100644
--- a/src/wp-content/themes/twentythirteen/functions.php
+++ b/src/wp-content/themes/twentythirteen/functions.php
@@ -85,6 +85,9 @@ function twentythirteen_setup() {
 	// Add support for full and wide align images.
 	add_theme_support( 'align-wide' );
 
+	// Add support for responsive embeds.
+	add_theme_support( 'responsive-embeds' );
+
 	// Add support for custom color scheme.
 	add_theme_support(
 		'editor-color-palette',
diff --git a/src/wp-content/themes/twentytwelve/functions.php b/src/wp-content/themes/twentytwelve/functions.php
index 62d3a9a741..9fedeecd52 100644
--- a/src/wp-content/themes/twentytwelve/functions.php
+++ b/src/wp-content/themes/twentytwelve/functions.php
@@ -61,6 +61,9 @@ function twentytwelve_setup() {
 	// Load default block styles.
 	add_theme_support( 'wp-block-styles' );
 
+	// Add support for responsive embeds.
+	add_theme_support( 'responsive-embeds' );
+
 	// Add support for custom color scheme.
 	add_theme_support(
 		'editor-color-palette',